368 



PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



Differentiation of the Borers. 



The larval forms of the Zeuzerid, Noctuid and Pyralid borers can be 

 distinguished with the help of the following key : 



1. Prothoracic shield with short spines .... 

 Prothoracic shield without spines .... 



2. Colour, deep purple 



Colour, pale yellowish-white ; body speckled with 

 violet markings ...... 



3. Caterpillars with the body of a uniform colour, with- 



out stripes, warts, spots or markings . 



Caterpillars having stripes, warts, spots or markings 

 on the body ....... 



4. Caterpillars grouped as below according to colour : — 



A. Colour creamy yellow ; skin almost transpa- 

 rent ; body very soft and pliable, slightly 

 compressed dorsoventrally ; thoracic region 

 prominently tapering forwards ; dorsal vessel 

 very prominent ; spiracles like a slender 

 brown streak ...... 



B. Colour greenish-yellow ; body cyUndrical, of a 

 rather slender build ; dorsal vessel visible ; 

 spiracles much elongated, oval, with a black 

 or brown rim ...... 



C. Colour pinkish, like that of raw flesh ; spiracles 

 elongated oval, black . ' . 



G. Colour white (or creamy white) with or without 

 the dorsal vessel being visible ; spiracles oval 

 or round ....... 



H. Colour green or partly green and copperish ; 

 spiracles round ..... 



I. Colour light grey ; skin soft ; hairs long ; forming 

 silken galleries in which pellets of excreta are 

 webbed ; spiracles oval .... 



5. Caterpillars with six stripes ..... 



Caterpillars with less than six stripes or with warts 

 (species of Chilo and Diatrcea which had hitherto 

 been known as the Moth-borer — Chilo simplex) 



6. With middorsal stripe ..... 

 Without middorsal stripe ..... 



7. Spiracles closed, i.e., without any clear s^ace inside ; 



no other longitudinal stripe but segments having 

 purplish markings on side .... 



Spiracles open, i.e., with a clear space inside ; in 

 addition to the middorsal stripe there are two 

 stripes on each side of back .... 



2 

 3 



C. S. 1805. 



C. S. 1696. 



4 



ScirpopTiaija xanthogas- 

 irella ; S. monos- 

 tigma. 



Scho&nobius bipiinc- 

 tifer ; Schoenobius 

 sp. (C. S. 1780). 



Sesaviia infereyis ; 

 Sesamia uiiiformist 

 (C. S. 1666.) 



Emmalocera depres- 

 sella ; Emmalocera 

 sp. (C. S. 1771); 

 C. S. 1837; C. S. 

 1700. 



Raphimetopus ablu' 

 tella. 



Dasyses rugosellus 

 (C. S. 1873). 



Procometis trochala. 

 (C. S. 1708.) 



6 



7 

 10 



C. S. 1835 



